inf = 10 ** 20
def f(t1, t2, t3):
    val = 0
    ma = t1[0]
    if t2[0] < ma:
        ma = t2[0]
    else:
        ma -= 1
        val += t2[1] * (t2[0] - ma)
        
    if t3[0] < ma:
        ma = t3[0]
    else:
        ma -= 1
        val += t3[1] * (t3[0] - ma)
        
    if ma <= 0:
        return inf
    else:
        return val 

T = int(input())
for _ in range(T):
    A, B, C, X, Y, Z = map(int, input().split())
    ans = inf
    ta, tb, tc = (A, X), (B, Y), (C, Z)
    ans = min(ans, f(tb, ta, tc))
    ans = min(ans, f(tb, tc, ta))
    ans = min(ans, f(tc, ta, tb))
    ans = min(ans, f(ta, tc, tb))
    print(ans) if ans != inf else print(-1)